The
rare and bizarre air eel swims through the air in the same way that
normal eels swim through the water, though it can also slither on the
ground if need be. They drown in water.

The
air eel attacks by either a bite or by releasing a bolt of
electricity from its mouth, having a range of 4” and striking but a
single target. This is a clumsy attack (-2 to hit) but does 1d8+2
points of damage, saving throw effectively halves that. The eel can
fire off a bolt of lightning once every other round, requiring the
intervening time to recharge.

This
creature possesses lungs instead of gills and are able to float due to
a special organ that holds a lighter-than-air gas. This gas is
unstable and can explode in certain conditions. If the finishing
blow to the eel is delivered by fire, such as a torch, flametongue
sword, fireball,
red dragon breath, etc., the resulting explosion will cause 2-16
points of damage to anyone within 10 feet.